3446. 骰子点数之和问题

//********** Specification of Combination **********
double probability(int n, int k);
/* Precondition:  n和k为整数
   Postcondition: 返回n个骰子同时扔后点数之和为k的概率
*/
double probability(int n, int k) { //TODO: your function definition

}

#include <stdio.h>

int main() {
    int n, k;
    scanf("%d%d", &n, &k);
    printf("%.6f\n", probability(n, k));
    return 0;
}